Hinged last.



C. C. DUDGE.

HINGED LAST. APPLICATION HLED AUG. H. HHS.

1 ,26 1 ,781 Patented Apr. 9, 1918.

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cmLES C. DODGE, OF WORCESTER, MASSACHUSETTS.

HINGED LAST.

Specication of Letters Patent.

Application led August 11, 1915. Serial No. 45,019.

To .all 'whom it may concern Be itA known that I, CHARLESV C. Doven,aciti'zen of the United States, and resident of Worcester, in thecounty. of Worcester and State of Massachusetts, have invented certainnew and useful Improvements in Hinged Lasts, of which the following is aspecification.

This invention relates to hinged lasts, and its object is to rovide animproved hinge structure there or. The hinge comprises two coperativehinge members formed to be connected b hookin one into the other, and tobe capa le of re ative angular movement, and a spring arran ed to holdthem in coperative relation. vhen the lastV is straightened for use, theforce of the spring holds the last in straightened condition; an whenone of the parts of the last is moved relatively to the other to shortenthe last, the spring is moved so that its center line crosses the axisof the hinge, and the spring then holds the last in its shortenedcondition. The hinge structure is such thatit is ca able of beingassembled in coperative re ation together with its spring before thehinge structure is assembled with the last and is therefore capable ofbeing inspected, tested and otherwise handled as a complete, operable,self-contained unit before it is set in a last. The manufacturer of thehinge structure is therefore enabled to observe any defect in theoperation of the hinge structure before the latter goes to the last mannfacturer, and the handling of the hinge structure by the lastmanufacturer is facilitated if the hinge structure is assembled when itis received by him, because the operation of setting the hinge structurein the last does not necessitate taking apart the hinge structure.

Of the accompanying drawings, which illustrate one form 1n which theinvention may be embodied:

Figure 1 represents a plan View of ablank of ductile sheet metal fromwhich one of the hinge members is formed.

Fig. 2 represents a top plan view of a hinge member formed from a blanksuch as that shown by Fig. 1.

Fig. 3 represents a view of the assembled hinge structure including thespring, one of the hinge members being shown insection and the other onebeing shown in elevation.

The angular position of the hinge members corresponds to the angularposition of theV Fig. 6 represents an end elevation of the.

hinge member shown by Fig. 2.

Fig. 7 represents an edge view of the hinge member which is shown at theright of Figs. 3 and 4.

Fig. 8 represents a side elevation of a last adapted to take the hingestructure shown by Figs. 3 and 4, the hinge-receiving sockets belngindicated by dotted lines.

Fig. 9 represents a longitudinal section of the last shown by Fig. S,showing the hinge structure assembled therein.

YFig. 10 represents a sectional view through the structure intersectedby line 10-10 of Fig. 9, the spring being omitted.

Fig. 11 represents a section through the structure intersected by line11-11 of Fig. 9.

Fig. 12 represents an enlarged view of the interengaged portions of thetwo hinge members.

The same reference characters indicate the same parts wherever theoccur.

The blank 15 shown y Fig. 1 may be stamped from ductile sheet metal by asin gle operation of a die press. The longitudi-V nal portions 16, 16 ofthe blank are connect.- ed at one end by a bridge portion 17, and at theopposite end by a bridge or rocker portion 18. The Side portions arepunched to provide holes 19, 19 for the reception of a pin whereby themember may be anchored in one of the parts of the last. A tongue 2O isformed upon the member 15 to provide a seat for a helical compressionspring, the edge portions 21-21 of the tongue affording the said seat.The projection 22 between the edge portions 21, 21 is adapted to extendinto the spring to keep the latter centered with relation to the member15. The side portions 16, 16 of the blank are offset as indicated atr23,23, for the purpose of making the hinge member wide enough to PatentedApr. 9, 1918.

V435 of the hook member.

receive the spring and also to make the member relatively narrow at theend which is to be interengaged with the other hinge member.

In the process of forming the blank l5, the side portions 16, 16 arebent toward each other into Substantially parallel relatlon, the o fsetortions 23 are bent as indicated at 23 in ig. 2, and the tongue 20 isbent as shown by Figs. 3, 4 and 9. As a result of this operation thepin-receiving holes 19 are brought into line with each other, and achamber 24 (Fig. 2) is provided for the reception of the spring.

The other hinge member is in the form of a hook, and comprises a hookportion 25 and a shank portion 26. For the purpose of identifying thetwo hinge members, the member 25, 26 is hereinafter termed the hookmember because of its hooked formation, and the member shown by Fig. 2is termed the staple member because of its staple-like form. The hookmember may be formed from sheet metal by a single operation of a diepress. The shank portion 26 is punched to provide a pin-receiving hole27 whereby it may be anchored in the last. The hook portion is formed toreceive the bridge portion 18, and the crotch of the hook portion asdefined by the curved edge 28 (see Fig. 12) aiords a seat for the edge18 of .the bridge portion 18. The center of the curved edge 28 isindicated at 30 in Fig. 12, and this center is the axis of relativeangular movement of the hinge members.

A, helical compression sprin 31 is arranged in the chamber 24, an itsend 32 is seated upon the edge portions 21. The other end portion 33 isbent so as to intersect the axis of the spring, and is seated in a notch34 between two projections 35,

The spring performs three distinct functions, namely, it keeps therocker portion 18 seated in the crotch of the hook portion, it holds thehinge members in the angular relation shown by Fi 3, and it holds thehinge members in t e angular relation shown by Fig. 4. The notch or seat34 is so arranged that it crosses the line which intersects the seat 21,21 and the axis 30 of angular move ment, when one hinge member rocksupon the other.

The side portions 16, being relatively close to each other at the endwhich receives the hooky portion 25', hold the hook member so that thevtwo members will not tip laterally with relation to each other.

The forepart 36 and heelpart 37 are formed with coperative, ortionswhich Tprovide a knuckle joint, the eelpart having companion knuckleportions 38 and the forepagfhaving a. socket 39 in which the por- 138are arranged. The forepart and heelpart may be integral when the last isturned, and then cut apart by a band saw. In the process of sawin thelast to form the knuckle portions 38 an socket 39, I refer to start theoperation at the point indicated at 40 in Fig. 8 and to progress in thedirection of the arrow, stopping at the point indicated at 41. I thensaw into the bottom oi' the last to form the confronting faces 42 and43, leaving an appreciable amount of stock 44 between the latter andpoint 41. I then break the narrow web of uncut stock by holding the lastby one end and striking a light blow upon the other end. The uncut stock44 is thus left to keep the bottom sur faces of the two parts Hush whenthe last and hinge are assembled. I then saw into the knuckle portion ina plane from to to bottom, to divide the knuckle portion into twosections. A hole is drilled into the heelpart to provide a socket 45 forthe reception of the shank portion 26 of the hook member. A hole 46 isbored to receive a pin 47, said pin being driven through the hole 27 inthe hook member to anchor the latter in the heelpart. A socket 48 isbored in the forepart to receive the sta le member and spring, and ahole 49 is ored through the forepart, intersecting the socket 48, toreceive the pin 50, said pin being driven through the holes 19, 19 inthe staple member to anchor the latter in the forepart. The diameter ofthe socket 45 is substantially equal to or slightly less than the depthof the shank portion 26, and consequently, in order to insert the shankportion into the socket, it is necessary to drive it with considerableforce because the four edges 51 of the shank portion will indent thewood as shown by Fig. 11. In consequence of driving the shank portioninto the wood as just explained, the hook member is held so firmly thatit will not be capable of twisting about the axis of the socket. In likemanner the staple member of the hinge and the socket 48 therefor areproportioned so that considerable force will be required to drive 'thestaple member into the forepart, the four edges 52 of the staple memberbeing caused to indent the forepart, as shown by Fig. '10,

When the last and hinge structure are as-4 sembled, the axis 30 (Fig.12) of the. hinge structure coincides with 8) of the knuckle joint.While the forepart and heelpart remain in the relation shown by Fig. 9their confronting faces 42 and 43 are pressed against each other by theforce of the spring, and when one of the parts of the last is movedrelatively to the other to slierten the last, the surfaces 54 and 55 arebrought into contact with each other and pressed against each other bythe spring.

The elect of the spring in holding the last in its two angular positionsis substanthe axis 53 (Fig...

tially equal. The holding effect, however, when the last isstraightened, is supplemented by the edge fofthehook member and edge 57of the'staple member. The ed e 56 intersects slightly the arc traversedy the edge 57, and it is therefore necessary to apply considerable'forceto the forepart and heelpart. in order to move the surfaces 472 and 43into abutting relation. so applied causes a wedging action of the edge57 against the edge 56, and these two edges are consequentl forcedagainst each other with a substantial degree of pressure which causesthem to have a frictional holding effect.

I claim:

l. A last hinge comprising two angularly movable members one of whichhas a rocker portion and the other of which has a crotched bearingportion, said rocker portion being seated in said crotched portion toform hinge-connection between said members, and a spring arranged to acton said members to keep said rocker portion seated in said crotchedportion.

2. A last hinge comprising two angularly movable members one of whichhas a rocker portion and the other of which has a hook portion, saidrocker portion being seated in the crotch of said hook portion, and aspring arranged to act on said members to keep said rocker portionseated in said crotch.

3. A last hinge comprising two angularly movable members one of whichhas confronting shank portions separated from each other and a brid eportion connecting said shank portions, t e other one of said membershaving a hook portion, said brid e ortion being seated in the crotch ofsaid iiook portion, and a spring arranged between said confronting shankportions and acting upon said members to keep said bridge portion seatedin said crotch.

4. A last hinge comprising two angularly movable members one of whichhas a rocker portion and the other of which has a hook portion, saidrocker portion being seated in the crotch of said hook portion, saidmembers having surfaces arranged to coact with each other to limit therelative angular movement of said members, and a spring arranged to acton said members to hold them in a predetermined angular relation withsaid coactive surfaces against each other.

5. A last hinge comprising two angularly movable members one of whichhas a hook portion, said hook portion having a substantially U-shapedcrotch, the other one of said members having two coperative shankportions and a bridge portlon connecting them, said bridge portion beingseated in said crotch, and a helical compression s ring seated againstsaid two members an ar- The forceY ranged to kee said bridge portionseated in the said crotch.

G. A last hinge comprising a staple member, a hook member the bridgeportion of said sta le member being arranged to bear and roer in thecrotch of said hook member, and a spring arranged to exert stress uponsaid members to keep said bridge portion in said crotch.

7. A last hinge comprising a staple member, a hook member, the bridgeportion of said staple member being arranged to bear and rock in thecrotch of said hook member, said members having confronting springseats, the said seat of said hook member being between said crotch andthe said seat of said staple member and being movable across the lineintersecting the latter said seat and crotch, in consequence of relativeangular movement of said member, and a helical compression springarranged on said seats to keep said bridge portion seated in saidcrotch.

8. A last hinge comprising a staple member, a hook member, the bridgeportion of said staple member being arranged to bear and rock in thecrotch of said hook member, the sides of said staple member beingarranged to bear against the sides of said hook member to preventrelative twisting of said members, and a spring arranged to act on saidmembers to keep said bridge portion seated in said crotch.

9. A last hinge comprising two angularly movable members havingrespectively cooperative interengaged hook and staple portions adaptedto rock upon each other, and a helical compression spring seated uponsaid members and arranged to kee said portions interengaged in hinged reation, said members having spring-engaging means arranged to shift saidspring laterally across a dead center in consequence of relative angularmovement of said members, whereby said spring is caused to oppose suchmovement toward said dead center from either side of the latter.

10. A last hinge comprising two angularly movable members havingrespectively coperative interengaged hook and staple portions adapted torock upon each other, and having cooperative friction surfaces arrangedto be moved into and out of engagement with each other by relativerocking www forepart and heelpart capable Vof relative hook, and the oheVone of sad'inem 12, In combination, a last comprising a. heelpart, oneof seid members angular movement about an axis'while repivotally engaginsaid hook. Y

:naming in contact, and a hinge connecting In testimony' w ereof I haveeixed my 5 said forepart and heelpart, said hinge comsignature. Y

prl'ing two singularly movable members fastened respectively to saidforepart and. CHARLES C. DGDGE.

Copies of thin patent may be obtained for ave cents eaqh, by dressingthe Uommlslioner of hun!! Washington, D. C. i

